Trap set in earnest, leave it out (7)
I believe the answer is:
ensnare
'trap' is the definition.
(synonyms)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for ensnare that I've seen before include "Ecstatic expression of feeling" , "Capture, trap" , "Ambush" , "Catch as if in a trap or net" .)